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Additional info for Environmental and Source Monitoring for Radiological Protection (IAEA RS-G-1.8)
The choice of the sampling and measurement procedures will depend on: (a) (b) (c) The characteristics and amounts of discharged radionuclides and the sensitivity of the measurement system; The expected variation with time, if any, in the discharge rates of the radionuclides; The likelihood of unplanned discharges requiring prompt detection and notification. 20. In all situations, it will be necessary to make provisions for the accurate determination of the volume of material discharged as a function of time so that the total activity discharged over a given time period can be computed on the basis of measurements of activity concentration.
In general, the following data are established as part of the licensing process: — The spectrum of radionuclides expected to be released in different operational states, including abnormal states; — Exposures via important pathways that contribute to the doses and the doses to be expected due to discharges; — The discharge limits. 6. One of the main goals of the monitoring programme is to check the assumptions and validate the results of the safety assessment. Thus, the monitoring programme should pay particular attention to the critical pathways and the critical radionuclides.
The required monitoring may include both environmental monitoring and individual monitoring. 7. In rare circumstances, if the assessed annual dose to the average individual member of the critical group arising from all relevant practices, estimated on the basis of environmental monitoring, is approaching the dose limit, a reassessment of the doses to the critical group should first be made by the registrant or licensee and then validated by the regulatory body. Table 2 outlines the major areas of responsibility for registrants, licensees and the regulatory body concerning the different types of monitoring.